GradientofUnsaturatedDataSet1 not found

Under the filters tab GradientofUnsaturatedDataSet1 is missing.
Need to plot Wall Shear Stress for my project. For this i need to have gradient of magnitude.
Version - Paraview 5.10.1

Do you mean Gradient of Unstructured DataSet? That filter’s functionality has been rolled into the Gradient filter. See this Release Note for ParaView 5.10.0.